Fox was indicating from police and news that at least 3 dead and 30 injured. Also, indicating they have recalled all EOD personnel. Explosions are from more than one local, does not appear to a gas explosions.

I don't think there is a way to stop it, short of eradicating the entire human race (please don't misconstrue what I said as advocating human genocide). A person determined to commit mayhem will find a way.

My questions are were these devices emplaced IEDs or is it possible that people wearing bomb vests caused this? If they were emplaced IEDs how were they hidden that the bomb dogs missed them?

I have been watching the raw footage closely and I am by no means an explosive expert, but does that look like a standard pipe bomb to anyone else? Perhaps made with black powder? Thats the only thing that I could think of that would cause that much smoke and flames.